Molded case circuit breaker is a type of power protection equipment, whose main function is to control the current in the circuit and provide protection. The device consists of a triggering device, a thermal relay, an operating mechanism, and a plastic casing.

When the current in the circuit exceeds the rated value during operation, the thermal relay will sense the high temperature inside the circuit and send a signal to the triggering device. After receiving the signal, the triggering device quickly cuts off the circuit to protect the circuit and equipment. If there is a fault or abnormal situation in the circuit itself, the molded case circuit breaker will automatically trip to avoid further damage to the equipment.

At the same time, the molded case circuit breaker also has a manual operating mechanism. When maintenance or repair is required, the circuit breaker can be manually reset to close again.

It should be noted that choosing the appropriate model of molded case circuit breaker is very important, as different models of molded case circuit breakers have different rated currents and rated operating voltages. Choosing the correct model can ensure that the molded case circuit breaker can work effectively and provide necessary power protection.